A 3-year-old boy was in serious condition Sunday after riding his tricycle into a pool, according to the Chandler Fire, Health and Medical Department.

The boy was playing at his grandmother's house near Dobson and Ocotillo roads when he fell in, said Val Gale, assistant chief for the department. Gale said the boy's grandmother saw the fall and was able to pull him out of the pool.

When medical officials arrived, the boy had a good heartbeat but needed help breathing through a ventilator, Gale said. He is expected to survive.